<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt_rt" %>

<html>
<head>
    <title>登录页</title>
    <%--echart线图、柱状图、饼图等各种图型库 cdn--%>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/echarts/5.4.3/echarts.min.js"></script>
    <%--jquery cdn--%>
    <script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.1/jquery.js"></script>
</head>
<body>

研制单位 <select name="companyId">

    <c:forEach items="${companyList}" var="c">
        <option value="${c.id}">${c.name}</option>
    </c:forEach>
</select>

<button onclick="zzt()">柱状图</button>

<div id="main" style="width: 500px;height: 500px"></div>

</body>
<script>

    function zzt() {

        let companyId = $('[name=companyId]').val();
        $.ajax({
            url: '/zzt.do?companyId=' + companyId,

            success: function (data) {

                console.log(data)
                var x = []
                var y = []
                // 找到最大的y
                var  maxY = 0;
                for (let i = 0; i < data.length; i++) {
                    let ydata = data[i].ydata;
                    if (maxY < ydata){
                        maxY = ydata;
                    }
                }


                for (let i = 0; i < data.length; i++) {

                    x.push(data[i].xdata)

                    let ydata = data[i].ydata;
                    if (ydata == maxY){ // 红柱子
                        y.push({
                            value: ydata,
                            itemStyle: {
                                color: '#a90000'
                            }
                        })
                    }else { // 普通柱子
                        y.push(data[i].ydata)
                    }

                }



                var chartDom = document.getElementById('main');
                var myChart = echarts.init(chartDom);
                var option;

                option = {
                    xAxis: {
                        type: 'category',
                        data: x
                    },
                    yAxis: {
                        type: 'value'
                    },
                    series: [
                        {
                            data: y,
                            type: 'bar'
                        }
                    ]
                };

                option && myChart.setOption(option);
            }


        })
    }
</script>
</html>